Water-tube boiler.



No. 636,627.k Patented Nov. 7, |899.

J. R. BRDWNELL.

WATER T UBE BUILER.

(Applicatn led May B, 1899.)

(No Model.)

% INVENTEIR.

TTCIRNEY.

WITNEEEES,

UNITED STATES PATENT 'OEETCEs .IOHN R. BROWNELL, OF DAYTON, OHIO, ASSIGNOR TO THE BROWNELL 65 COMPANY, OF SAME PLACE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent N o. 636,627, dated November 7, 1899 Application filed May 8, 1899. Serial No. 715,926. (No model.)

ful Improvements in Water-Tube Boilers;

and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, which forms a part of this specification.

This invention relates to improvements in Water-tube boilers, with particular reference to the class of boilers which have inner and outer tubes.

The objects of the invention are, first, to provide means whereby the two currents of Water--to wit, the descending and ascending currents-Wll not interfere With each other in the head, and, secondly, to provide means for separating from the water mineral substances-such as lime, magnesia, duc-before it enters the head. Owing to the greatly-impregnated condition of the water with the aforesaid mineral substancesin this and other sections of the country, the scale or incrustation formed in the boiler and tubes is a constant source of annoyance and expense. The invention hereinafter described obviates these difficulties.

Referring to the accompanying drawing, the gure is a sectional elevation ofa tubular boiler made in accordance with my invention.

In the specification similar reference characters indicate corresponding parts.

One essential feature of my invention is in placing the open ends of the inner circulating-tubes A and the open ends of the outer tubes B a substantial distance apart. From the drawing it Will be noticed that the distance from the front ends of the tubes A and B is considerable as compared to the boilers now commonly in use. In the arrangement of the inner tubes A their open ends are brought as close as possible to the front header-wall C, while the corresponding ends of the outer tubes B lie just inside of the inner wall D. This arrangementenables both currents of Water to pass Without commingling or interfering with the passage of each other, and thus the necessity of separating the space in the head into two different compartments by means of a partition-Wall or diaphragm is obviated. The front ends of the inner circulating-tubes may be brought close to the outer wall, as is shown in the drawing, without fear of obstructing the passage of the water to said tubes, as the suction due to the circulation of the water and steam draws the colder water into these tubes.

From the foregoing description it will be apparent that both sets of tubesto wit, the inner and outer tubes-may be easily removed through the hand-holes usually provided in the outer wall of the header, there being no troublesome partition-wall or diaphragm to interfere with their removal.

E and E designate a double or return trough which is located in the steam-separating drum F and through which the Water entering through the feed-pi pe G is made to travel a distance equal to double the length of the said drum before said water enters the header. The bottoms of this double trough are corrugated throughout to provide a series of transverse pockets I, over which the Water passes and which interrupts the passage of the Water constantly in its How, and thereby causes more or less precipitation into said pockets of the mineral substances contained in said water. The two sections of the trough are nclosed throughout by a flat cover. The Water enters the first settling-pan K and rising therein passes over the upper section E of the trough to a second settling-pan K'. The Water rising in this last-named settling-pan passes down through the lower or return section EV of the trough and discharges into the header through the second feed-pipe I. This pipe is arranged to pass the water into the head close to the front wall and above the receiving ends of the inner circulating-tubes. y L is a blow-olf pipe connected with the settling-pan K' for cleansing it of the accumulations of sediment.

Having described my invention, I claim- 1. In a Water-tube boiler, the combination with a head having outer and inner walls, of

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outer tubes having their open ends supported in the inner wall of said head and terminated iiush with said inner wall, and inner circulating-tubes having their open ends projected beyond the vertical center of the head and occupying posit-ions adjacent to the front wall of the head, and a feed-pipe projected into the head adjacent to the front wall and above the ends of said inner tubes, the feedwater entering said pipe after traversing substantially twice the length of the steam-separating drum, substantially as shown and described.

2. In a water-tube boiler, the combination with a steam-separating drum, of a water-puriiier consisting of a double or return trough in two sections, E and E, one above the other with their bottoms corrugated throughout, an initial settling-pan K with which the upper section alone communicates and is supplied, a supplementary settling-pan K at the opposite end and with which both sections of said trough communicate, the said supplementary settling-pan being a receiver from the u pper section and a feeder for the lower section of said trough, and means for relieving said supplementary settling-pan ot' sediment, as shown and described.

3. In a water-tube boiler, the combination with a steam-separating drum and a head communicating therewith, of a Water-purifier located within said drum and consisting of a trough in two sect-ions, each section being substantially the length of the drum and having its bot-tom corrugated throughout, an initial settling-pan from which one of said sections is fed, a supplementary settling-pan communicating with both of said sections and feeding the lower section, a series of outer tubes having ends supported in the inner wall of the head and terminating iiush with said wall, a series of inner circulatingtubes having ends projected beyond the vertical center of the head and occupying positions adjacent to the outer Wall of the head, and a feedpipe communicating with the lower section of the water-purifier and discharging close to the front wall of the head, substantially as shown and described.

et. In a water-tube boiler, the combination with a head, of outer circulating-tubes having their open ends supported in the inner wall of said head and terminating iush with said inner wall, and inner circulating-tubes having their open ends projected beyond the Vertical center of the head and occupying positions adjacent to the front wall and a feedpipe above the ends of said inner tubes,where by the feed-water is introduced to the inner circulating-tubes adjacent to the front wall, and passing through said tubes, is discharged from the outer circulating-tubes adjacent to the inner wall, thereby preventing anyinterference between the descending and ascending currents of water, and dispensing with the use of a diaphragm in the head.

In testimony that I claim the foregoing as my own I hereto affix my signature in presence of two witnesses.

JOHN R. BROVVNELL.

lVitnesses:

R. J. MCCARTY, CARL II. Non. 

